What project design feature would decrease energy costs in a building?

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试卷: LEED GA模拟题D[查看]
What project design feature would decrease energy costs in a building?

A: Increased Ventilation with a mechanical system
B: Installing equipment that uses more kBtu
C: Purchasing materials with low VOC content
D: Cogeneration

参考答案: D

本题解释:
Notes:

Reference: Guide to Purchasing Green Power
Increased ventilation often increases the need for more energy for the additional ventilation. One way to offset the increased energy use is to use heat recovery - a type of cogeneration. Overall though the energy use/costs would go up.

kBtu / square foot / year is an energy use intensity measurement. A lower kBtu will use less energy.

VOC content is rarely a factor in energy use.

Combined heat and power (CHP) is an electricity generation technology, also known as cogeneration, that recovers waste heat from the electric generation process to produce simultaneously other forms of useful energy, such as usable heat or steam. On average, two-thirds of the input energy used to make electricity is lost as waste heat. In contrast, CHP systems are capable of converting more than 70 percent of the fuel into usable energy. (Guide to Purchasing Green Power)

The high efficiency of CHP technology can result in energy savings when compared to conventional, separately purchased power and onsite thermal energy systems. To determine if CHP is likely to offer a compelling return on investment at a particular site, the costs of the CHP system (capital, fuel, and maintenance) should be compared to the costs of purchased power and thermal energy (hot water, steam, or chilled water) that would otherwise be needed for the site. (EPA)